A dog breeder wishes to develop a breed that does not bark. She starts witha diverse mixture of dogs. Generation after generation, she allows only the quietest dogs to breed. After 30 years of work she has a new breed of dog with interesting traits, but on average, the dogs still bark at about the same rate as other dog breeds. Which of the following would be a logical explanation for her failure?
A) There is no variation for the trait (barking)
B) The tendency to bark is not a heritable trait.
C) The selection was artificial, not natural, so it did not produce evolutionary change
D) There was no selection (differential reproductive success) related to barking behavior
E) All of the above.
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Ответ:
Let's see what makes the amount of Bi-carbonate ion low in X!
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The question is a bit tricky so read the below points carefully.
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This is what happens inside the Red blood cells:-
At First Hydrogen ion reacts with bicarbonate ion thus forming carbonic acid .Reaction :
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This bicarbonate in presence of Carbonic anhydrase, converts into carbon-di-oxide and water just before crossing the pulmonary capillary wall! The same happens with the carbaminoharmohlobin!━━━━━━━━━━━━━━━━
Thus the PCO2 is high though the amount of Bi-carbonate ion is low in X!
And just the opposite happens when blood is travelling from alveoli to tissue